CN117403015A - Energy consumption estimation method based on expanding blast furnace Rist operation line - Google Patents
Energy consumption estimation method based on expanding blast furnace Rist operation line Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 59
- 238000005265 energy consumption Methods 0.000 title claims abstract description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 157
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 146
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 132
- 239000000428 dust Substances 0.000 claims abstract description 55
- 229910052742 iron Inorganic materials 0.000 claims abstract description 53
- 238000004364 calculation method Methods 0.000 claims abstract description 47
- 239000007787 solid Substances 0.000 claims abstract description 31
- 238000003723 Smelting Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 24
- 230000009467 reduction Effects 0.000 claims abstract description 21
- 238000005259 measurement Methods 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 7
- 239000000446 fuel Substances 0.000 claims abstract description 6
- 229910052760 oxygen Inorganic materials 0.000 claims description 53
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 51
- 239000001301 oxygen Substances 0.000 claims description 51
- 229910000805 Pig iron Inorganic materials 0.000 claims description 29
- 239000007789 gas Substances 0.000 claims description 22
- 239000002893 slag Substances 0.000 claims description 17
- 239000003245 coal Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 9
- 229910052717 sulfur Inorganic materials 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 239000002817 coal dust Substances 0.000 claims description 7
- 238000006477 desulfuration reaction Methods 0.000 claims description 6
- 230000023556 desulfurization Effects 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 5
- 239000000956 alloy Substances 0.000 claims description 5
- 229910052698 phosphorus Inorganic materials 0.000 claims description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 4
- 239000011593 sulfur Substances 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims 1
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 15
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 14
- 239000001257 hydrogen Substances 0.000 abstract description 14
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 21
- 125000004430 oxygen atom Chemical group O* 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 7
- 125000004432 carbon atom Chemical group C* 0.000 description 5
- 239000000571 coke Substances 0.000 description 5
- 125000004429 atom Chemical group 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000003034 coal gas Substances 0.000 description 3
- 230000036284 oxygen consumption Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005275 alloying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001721 carbon Chemical group 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013524 data verification Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005984 hydrogenation reaction Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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Abstract
The invention discloses an energy consumption estimation method based on an expanded blast furnace Rist operation line, which is used for finishing and calculating blast furnace process data based on calculation of the blast furnace Rist operation line, wherein the data comprises melted carbon content in molten iron and solid carbon content in furnace dust; substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the calculation of a blast furnace Rist operation line, and calculating the abscissa of the point A and the ordinate of the point E according to the measurement result; connecting the point A and the point E to obtain an AE operation line, converting the slope of the AE operation line into the carbon ratio of blast furnace smelting, and further representing the carbon consumption of the blast furnace charging fuel; the carbon content melted in the molten iron and the solid carbon content in the furnace dust are considered as fixed carbon under the condition of considering hydrogen reduction, and the carbon melted in the molten iron and the solid carbon in the furnace dust are considered as active carbon simple substances in blast furnace ironmaking and are substituted into the calculation of a blast furnace Rist operation line, so that the calculation error of the carbon consumption is reduced, and the capability of the blast furnace Rist operation line is expanded.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to an energy consumption estimation method based on an expanded blast furnace Rist operation line.
Background
The traditional blast furnace Rist operation line is proposed by the teaching of A.rist of the French iron and steel institute and is used for representing the change and transfer of three elements Fe-O-C in the blast furnace ironmaking process. The process of blast furnace smelting mainly comprises the process of extracting O from C in fuel, wherein O from three sources is combined with C to form CO or CO 2 Become gaseous carbon oxides. On a planar rectangular coordinate system, the ordinate is O/Fe (which indicates the number of O atoms that must be taken to smelt a Fe atom), and the abscissa is O/C (i.e., the number of O atoms bonded to a C atom). It is obvious that the more O atoms are required to be extracted for smelting each Fe atom, the more O atoms combined with C are in the gas generated by the reaction, that is, the two are in a direct proportion relationship, namely a straight line relationship, and the straight line is an operation line.
However, the conventional operating line cannot accurately characterize the molten iron carburization and furnace dust removal processes. The carburization of molten iron means that elemental carbon is melted into unsaturated molten iron, and the carbon discharge of furnace dust means that coke and pulverized coal form unburned pulverized coal and coke powder in a blast furnace and are discharged along with the furnace dust. The two processes have important influence on the carbon consumption in the blast furnace, but the carbon consumption cannot be accurately reflected in the traditional operation line, so that the error between the carbon consumption calculated according to the blast furnace Rist operation line and the actual carbon consumption is larger, and the method is not beneficial to more comprehensively and directly analyzing the carbon conversion and emission conditions in the blast furnace smelting process.
In the prior art, a blast furnace energy consumption monitoring and hydrogen-rich smelting prediction method based on a Rist operation line is disclosed in a patent with publication number of CN116189801A, blast furnace production data are imported, and the Rist operation line of a blast furnace with hydrogen participation is determined to monitor the blast furnace energy consumption, but the calculation method does not consider carbon in molten iron and furnace dust in actual production of the blast furnace, so that a certain deviation exists between prediction of a blast furnace energy consumption index and an actual result.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides an energy consumption estimation method based on an expanded blast furnace Rist operation line, which substitutes the melted carbon in molten iron and solid carbon in furnace dust into the calculation of the blast furnace Rist operation line by taking the melted carbon in molten iron and the solid carbon in furnace dust as active carbon simple substances so as to reduce the calculation error of carbon consumption, expands the capability of the operation line, and enables the operation line to more accurately disclose the carbon consumption and transfer process in the blast furnace production process, thereby more comprehensively and more directly analyzing the carbon conversion and emission conditions in the blast furnace smelting process.
In order to achieve the technical purpose, the invention provides an energy consumption estimation method based on an expanded blast furnace Rist operation line, which comprises the following steps:
based on the calculation of a blast furnace Rist operation line, finishing and calculating blast furnace process data, wherein the data comprise the content of melted carbon in molten iron and the content of solid carbon in furnace dust;
substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the calculation of a blast furnace Rist operation line, and calculating the abscissa of the point A and the ordinate of the point E according to the measurement result;
and connecting the point A and the point E to obtain an AE operation line, and converting the slope of the AE operation line into the carbon ratio of blast furnace smelting so as to represent the carbon consumption of the blast furnace charging fuel.
Preferably, the solid carbon content in the furnace dust ash is calculated by measuring the content of unburned coal powder and coke powder in the furnace dust ash.
Preferably, the calculation of substituting the carbon content melted in the molten iron and the solid carbon content in the furnace dust into the blast furnace Rist operation line is that substituting the carbon content melted in the molten iron and the solid carbon content in the furnace dust into the calculation of the abscissa of the point a, and the calculation formula of the abscissa of the point a is:
in the above, n co The amount of material that is CO in the top gas;CO being top gas 2 Is used in the preparation of a medicament,h being top gas 2 The amount of O species; n is n [c] As melted carbon in molten ironThe amount of the substance, n' [c] Omega for the amount of unburned coal dust and coke powder material discharged with the furnace dust CO 、/>Representing CO and CO in the top gas 2 Content of omega [C] 、ω' [C] The content of melted carbon in molten iron and the content of unburned pulverized coal and coke powder discharged along with furnace dust are represented by V, and the volume of blast furnace gas is represented by V.
Preferably, the ordinate calculation formula of the point a is:
in the above, ω (Fe 2 O 3 ) Representing Fe in ore 2 O 3 Is contained in the composition; omega (FeO) represents the content of FeO in the ore; omega (Fe) represents the total iron content of the ore.
Preferably, the abscissa of the E point is 0.
Preferably, the ordinate calculation formula of the E point is:
Y E ＝-(y f +y b )
in the above, y f The method is characterized by representing the oxygen intake amount of alloy element reduction and slag desulfurization in pig iron; y is b The amount of oxygen introduced into the blast furnace by the blast furnace is represented.
Preferably, the reduction of alloy elements in the pig iron and the desulfurization of slag brings oxygen into the amount y f Including the amount of oxygen carried in by the Si, mn, S, P four elements, then:
y f ＝y [Si] +y [Mn] +y (s) +y [P]
in the above, y [Si] Represents the amount of oxygen carried in by Si element; y is [Mn] Represents the amount of oxygen carried in by Mn element; y is (s) Represents the amount of oxygen carried in by the S element; y is [P] Represents the amount of oxygen carried in by the P element.
Preferably, the method for calculating the oxygen amount carried by the Si, mn, S, P four elements is as follows:
in the above formula, omega [ P ] represents the mass percentage of P element in pig iron; omega Si represents the mass percentage of Si element in pig iron; omega Mn represents the mass percentage of Mn element in pig iron; omega Fe represents the amount of reduced iron in pig iron; omega S represents the mass percent of sulfur in the slag; u represents the slag amount.
Preferably, the oxygen amount y brought into the blast furnace by the blast furnace b The calculation formula of (2) is as follows:
in the above, V b The blast furnace blast volume;represents the oxygen content, omega Fe, in the blown hot air]Indicating the amount of reduced iron in pig iron.
Preferably, the slope of the AE operating line is converted into a carbon ratio for blast furnace smelting, and the formula is as follows:
C' fixing device ＝k Fixing device ×12×Fe r /56
In the above, k Fixing device The slope of the AE operating line; fe (Fe) r Representing the amount of reduced iron per ton of pig iron; x is X A 、Y A Respectively the abscissa and the ordinate of the point A; x is X E 、Y E The abscissa and ordinate of the E point, respectively.
The beneficial effects of the invention are as follows:
the invention is based on H hidden in reduction in the blast furnace ironmaking process 2 In consideration of oxygen consumption in O, H generated by reduction 2 Oxygen in O is added into the calculation of the oxygen content of CO in a blast furnace Rist operation line, so that the accuracy of carbon atom consumption in CO is ensured; and the carbon content melted in the molten iron and the solid carbon content in the furnace dust are considered as fixed carbon under the condition of considering hydrogen reduction, and the melted carbon in the molten iron and the solid carbon in the furnace dust are taken as active carbon simple substances in blast furnace ironmaking and are substituted into the calculation of a blast furnace Rist operation line, so that the calculation error of carbon consumption is reduced, the capability of the blast furnace Rist operation line is expanded, and the carbon consumption and transfer process in the blast furnace production process can be more accurately uncovered, so that the conversion and emission conditions of the carbon in the blast furnace smelting process can be more comprehensively and more directly analyzed.
Drawings
FIG. 1 is a block flow diagram of the step of the energy consumption estimation method based on the extended blast furnace Rist operation line according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention due to unnecessary details, only structures and/or processing steps closely related to aspects of the present invention are shown in the drawings, and other details not greatly related to the present invention are omitted.
In addition, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The actual reaction of the blast furnace Rist operation line is the migration process of oxygen in the blast furnace, namely oxygen brought into the blast furnace from iron ore and blast air is migrated into coal gas, the ordinate is oxygen-iron ratio, the source of oxygen is oxygen, the abscissa is carbon-oxygen ratio, and the forward direction of oxygen (combustion can be understood as combustion and direct and indirect reduction of the extracted oxygen) so that the slope of a straight line under the coordinate system is C/Fe, namely the carbon ratio of blast furnace smelting is represented, and the raw fuel consumption level of blast furnace smelting is represented.
In the blast furnace Rist operation line, the carbon consumption is calculated from the slope of the AE operation line, and therefore, whether the slope of the AE operation line is accurate directly affects whether the estimation of the carbon consumption is accurate. The abscissa of the A point in the AE operating line is O/C, namely the number of O atoms combined with one C atom, the ordinate of the A point is O/Fe, namely the number of O atoms which must be extracted by smelting one Fe atom, and the slope of the AE operating line is C/Fe, namely the number of C atoms consumed by one Fe atom. It follows that the abscissa of point a is related to the number of O atoms.
In the blast furnace ironmaking process, oxygen in iron oxide is abstracted by hydrogen to combine with the iron oxide to generate H 2 O and CO are reduced to generate CO 2 The properties of the gas are the same, and the gas utilization degree is increased; when the amount of hydrogen charged is increased, the amount of oxygen combined with hydrogen cannot be ignored if H generated in the reduction is not considered 2 The oxygen consumption in O, while all the oxygen consumption is calculated as the carbon atom consumption in CO, the calculated carbon ratio is larger than the actual carbon ratio. Therefore, to ensure the accuracy of the blast furnace Rist operation line, the loss must be reduced to H 2 The oxygen in O is recovered, i.e. H generated by reduction 2 Oxygen in O is added to the oxygen content calculation of CO in the blast furnace Rist line.
In addition, in addition to hydrogen reduction, the content of melted carbon in molten iron and the content of solid carbon in furnace dust are also required to be considered, melted carbon in molten iron, unburned coal dust and coke powder discharged along with furnace dust are fixed into carbon simple substances moving in a blast furnace, and the carbon content moving in the blast furnace is increased if the carbon does not participate in the carbon-oxygen reaction. The melted carbon content in the molten iron and the solid carbon content in the furnace dust are considered as fixed carbon under the condition of considering hydrogen reduction, the influence of the hydrogen reduction is expressed in molecules of O/C of the abscissa of the point A, the influence of the fixed carbon is expressed in denominator of O/C of the abscissa of the point A, and the abscissa of the point A is shifted leftwards as a whole.
Based on the above, the invention provides an energy consumption estimation method based on an expanded blast furnace Rist operation line, which comprises the following steps:
s1, finishing and calculating blast furnace process data based on calculation of a blast furnace Rist operation line, wherein the data comprise melted carbon content in molten iron and solid carbon content in furnace dust.
Specifically, the data required for the operation line include data on ore composition, top gas, pig iron composition, slag, dust, pre-tuyere combustion carbon amount, general material balance and zone heat balance, and also include measurement of melted carbon content ω in molten iron [C] And the content omega 'of unburned coal dust and coke powder discharged with the furnace dust' [C] And the measurement result is converted into the amount of the substance to calculate, specifically, the solid carbon content in the furnace dust is calculated by the content of unburned coal powder and coke powder in the furnace dust.
S2, substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the calculation of a blast furnace Rist operation line, and calculating the abscissa of the point A and the ordinate of the point E according to the measurement result.
Let the coordinates of point A be (X A ，Y A ) Since the abscissa of the point a is O/C, i.e., the number of O atoms combined with one C atom, the carbon content melted in the molten iron and the solid carbon content in the furnace dust are considered as fixed carbon under the condition of considering hydrogen reduction, and the carbon content melted in the molten iron and the solid carbon content in the furnace dust are substituted into the calculation of the blast furnace Rist operation line, i.e., the carbon content melted in the molten iron and the solid carbon content in the furnace dust are substituted into the calculation of the abscissa of the point a, the calculation formula of the abscissa of the point a is:
in the above formula (1), n co The amount of material that is CO in the top gas;CO being top gas 2 Is used in the preparation of a medicament,h being top gas 2 The amount of O species; n is n [c] N 'which is the amount of melted carbon in molten iron' [c] Omega for the amount of unburned coal dust and coke powder material discharged with the furnace dust CO 、/>Representing CO and CO in the top gas 2 Content of omega [C] 、ω' [C] The content of melted carbon in molten iron and the content of unburned pulverized coal and coke powder discharged along with furnace dust are represented by V, and the volume of blast furnace gas is represented by V.
The abscissa value of the point A calculated according to the formula is smaller than that of the point A calculated according to the original blast furnace Rist operation line, so that the carbon content melted in molten iron and the solid carbon content in furnace dust are considered as fixed carbon under the condition of taking hydrogen reduction into consideration, and the carbon content melted in molten iron and the solid carbon content in furnace dust are substituted into the calculation of the blast furnace Rist operation line, so that the overall point A abscissa is shifted leftwards.
The ordinate of the point A represents the oxygen quantity of the iron oxide in the ore brought into the blast furnace, the oxygen quantity of the iron oxide in the ore brought into the blast furnace is unchanged, namely, the ordinate of the point A is consistent with a Rist operation line, and the calculation formula of the ordinate of the point A is as follows:
in the above formula (2), ω (Fe) 2 O 3 ) Representing Fe in ore 2 O 3 Is contained in the composition; omega (FeO) represents the content of FeO in the ore; omega (Fe) represents the total iron content of the ore.
Let the coordinates of E point be (X E ，Y E ) The abscissa of E point is 0, and the ordinate of E point represents the source of migrated oxygen, which can be divided into alloy element reduction and slag desulfurization carried-over oxygen amount y in pig iron f And the oxygen amount y brought into the blast furnace by the blast furnace b The ordinate calculation formula of the E point is as follows:
Y E ＝-(y f +y b ) (3)
in the above formula (3), yf represents the amount of oxygen introduced by reduction of alloying elements in pig iron and desulfurization of slag; y is b The amount of oxygen introduced into the blast furnace by the blast furnace is represented. Specifically, y f Including several common elements in the blast furnace smelting process, such as Si, mn, S, P, the calculation formula of yf is as follows:
y f ＝y [Si] +y [Mn] +y (s) +y [P] (4)
the calculation formula of the oxygen amount carried in by the four typical elements is as follows:
in the above formulas (4) (5) (6) (7) (8), ω [ P ] represents the mass percentage of the P element in pig iron; omega Si represents the mass percentage of Si element in pig iron; omega Mn represents the mass percentage of Mn element in pig iron; omega Fe represents the amount of reduced iron in pig iron; omega S represents the mass percent of sulfur in the slag; u represents the slag amount.
Oxygen amount y introduced into blast furnace by blowing b The calculation formula of (2) is as follows:
in the above formula (9), V b The blast furnace blast volume;represents the oxygen content, omega Fe, in the blown hot air]Indicating the amount of reduced iron in pig iron.
S3, connecting the point A and the point E to obtain an AE operation line, converting the slope of the AE operation line into the carbon ratio of blast furnace smelting, and further representing the carbon consumption of the blast furnace charging fuel.
Specifically, the slope of the AE operating line is calculated and converted into the carbon ratio of the blast furnace smelting, and the formula is as follows:
C' fixing device ＝k Fixing device ×12×Fe r /56 (11)
In the above formulas (10) and (11), k Fixing device The slope of the AE operating line; fe (Fe) r Representing the amount of reduced iron per ton of pig iron; x is X A 、Y A Respectively the abscissa and the ordinate of the point A; x is X E 、Y E The abscissa and ordinate of the E point, respectively.
Compared with the original blast furnace Rist operation line, the E point coordinate of the AE operation line in the energy consumption estimation method based on the expanded blast furnace Rist operation line is unchanged, the A point ordinate is unchanged, the A point abscissa is reduced, the AE operation line moves leftwards, the slope is increased, the calculated carbon consumption is increased, and the calculated carbon consumption is closer to the actual charging coke ratio and the coal ratio of blast furnace smelting, so that the calculated carbon consumption is closer to the actual value and the calculation error is smaller.
The energy consumption estimation method based on the extended blast furnace Rist operation line provided by the invention is described below with reference to the examples.
Example 1
Collecting data related to the blast furnace process, determining data required for the operation line, specifically ore composition, top gas, pig iron composition, slag, dust, pre-tuyere combustion carbon amount, general material balance and zone heat balance, including measuring the content omega of melted carbon in molten iron [C] And the content omega 'of unburned coal dust and coke powder discharged with the furnace dust' [C] The data collected are shown in tables 1 to 3
TABLE 1 blast furnace ore composition content (%)
TABLE 2 blast furnace top gas composition (%)
TABLE 13 pig iron component content of blast furnace (%)
And 317kg/t of slag, wherein the sulfur content in the slag is 0.9%; 15kg/t of furnace dust, 34.73% of carbon in the furnace dust; charging 390kg of coke ratio, and fixing the carbon content by 85.91%; coal ratio 125.7kg, coal dust containing 77.836%; amount of carbon burned before tuyere (C) b ) 270.832kg/t; air quantity 1160.983m3/t, and air blast humidity 1.5%; gas amount is 1661.943m3/t; coke powder carbon content in the dust = 15 x 0.3473 = 5.2095kg
Calculating the contents of melted carbon in molten iron and solid carbon in furnace dust in a blast furnace Rist operation line on a hydrogenation operation line, and calculating the abscissa of the point A and the ordinate of the point E according to the measurement result, wherein the concrete process is as follows:
the abscissa of the A point represents the number of O atoms combined with one C atom in the coal gas, namely the oxidation degree of the C in the coal gas, namely the indirect reduction degree, the melted carbon content in the molten iron and the solid carbon content in the furnace dust are considered as fixed carbon under the condition of taking hydrogen reduction into consideration, the abscissa of the A point is shifted left, and the calculation formula of the abscissa of the A point is as follows:
and the AE operation line calculation is carried out by using the traditional method without considering the original blast furnace Rist operation line containing carbon of molten iron and carbon discharged from furnace dust, and the abscissa calculation formula of the point A is as follows:
the ordinate of the point A represents the oxygen quantity of the iron oxide in the ore brought into the blast furnace, the oxygen quantity of the iron oxide in the ore brought into the blast furnace is unchanged, namely, the ordinate of the point A is consistent with the original blast furnace Rist operation line, and the calculation formula is as follows:
the a point coordinate calculated based on the energy consumption estimation method based on the extended blast furnace Rist operation line is (1.3029,1.4183).
The point A coordinates are (1.4580,1.4183) based on the original blast furnace Rist operation line.
The abscissa calculation formula of the E point is as follows: x is X E ＝0
The ordinate of E point represents the source of migrating oxygen, which can be classified into reduction of alloying elements in pig iron and slag desulfurization with oxygen intake y f And the oxygen amount y brought into the blast furnace by the blast furnace b Wherein
y f ＝y [Si] +y [Mn] +y (s) +y [P] ＝0.032
y b When the blast furnace tuyere blows air, the oxygen content carried in hot air is represented by the following calculation formula:
the ordinate calculation formula of the E point is as follows:
Y E ＝-(y f +y b )＝-(0.032+1.3417)＝-1.3737
therefore, the slope of the AE operation line calculated based on the energy consumption estimation method based on the extended blast furnace Rist operation line is as follows:
the slope of the AE operating line is converted into the carbon ratio of blast furnace smelting as follows:
C' fixing device ＝k Fixing device ×12×Fe r /56＝2.143×12×942.01/56＝432.578kg/t
The actual charging coke ratio and the carbon quantity brought by the coal ratio in blast furnace smelting are as follows:
C Z ＝390×0.8591+125.7×0.7784＝432.89kg/t
the two differ by 432.578-432.89 = -0.312kg, i.e. the deviation is 0.312/432.89 = 0.07%.
The slope of the AE operating line in the original blast furnace Rist operating line is:
the slope of an AE operation line in an original blast furnace Rist operation line is converted into a carbon ratio of blast furnace smelting, which is as follows:
C'＝k Rist ×12×Fe r /56＝1.9149×12×942.01/56＝386.5406kg/t
considering the carbon quantity of pig iron carburization and furnace dust removal, the furnace charging carbon quantity should be:
C＝386.54+48.9+5.2095＝440.65kg/t
the actual charging coke ratio and the carbon quantity brought by the coal ratio of the blast furnace smelting are as follows:
C Z ＝390×0.8591+125.7×0.7784＝432.89kg/t
the two differ by 440.65-432.89 =7.76 kg, i.e. the calculated result according to the original blast furnace Rist operation line is more than the actual situation, and the deviation is 7.76/432.89 =1.79%.
In summary, the carbon consumption was 386.54kg/t calculated on the basis of the original blast furnace Rist line, and after adding the carburized amount and the carbon amount discharged from the dust, the carbon consumption was 440.65kg/t, and the deviation was 1.79% from the actual carbon consumption 432.89 kg/t. According to the invention, the carbon content melted in the molten iron and the solid carbon content in the furnace dust are regarded as fixed carbon under the condition of considering hydrogen reduction, the coordinate of the point A is shifted left, the coordinate of the point E is unchanged, the calculated carbon consumption is 432.89kg/t, and the deviation is 0.07% compared with the actual carbon consumption. The carbon consumption calculated by the energy consumption estimation method based on the expanded blast furnace Rist operation line is closer to an actual value than the carbon consumption calculated by the original blast furnace Rist operation line, and the calculation error of the carbon consumption is smaller.
Through experimental data verification, the operation wire calculated by the energy consumption estimation method based on the extended blast furnace Rist operation wire can more accurately represent the carbon consumption process in the blast furnace, the blast furnace carbon ratio can be reversely obtained by taking the operation wire as a guide, and compared with the traditional operation wire, the error of the carbon consumption calculated by the energy consumption estimation method based on the extended blast furnace Rist operation wire is reduced to 0.07% from 1.79%. The application of the method can provide more comprehensive and direct analysis of carbon conversion and emission in the blast furnace smelting process. The technical scheme of the patent is simple and practical, can be applied to the field of blast furnace operation and energy efficiency optimization in the steel industry, and has positive significance for improving the energy utilization efficiency and environmental friendliness of the blast furnace.
The foregoing is only illustrative of the present invention and is not to be construed as limiting the scope of the invention, and all equivalent structures or equivalent flow modifications which may be made by the teachings of the present invention and the accompanying drawings or which may be directly or indirectly employed in other related art are within the scope of the invention.
Claims (10)
1. The energy consumption estimation method based on the extended blast furnace Rist operation line is characterized by comprising the following steps of:
based on the calculation of a blast furnace Rist operation line, finishing and calculating blast furnace process data, wherein the data comprise the content of melted carbon in molten iron and the content of solid carbon in furnace dust;
substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the calculation of a blast furnace Rist operation line, and calculating the abscissa of the point A and the ordinate of the point E according to the measurement result;
and connecting the point A and the point E to obtain an AE operation line, and converting the slope of the AE operation line into the carbon ratio of blast furnace smelting so as to represent the carbon consumption of the blast furnace charging fuel.
2. The energy consumption estimation method based on the extended blast furnace Rist operation line according to claim 1, wherein the solid carbon content in the furnace dust is calculated by measuring the content of unburned pulverized coal and coke powder in the furnace dust.
3. The energy consumption estimation method based on the extended blast furnace Rist operation line according to claim 1, wherein the calculation of substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the blast furnace Rist operation line is that substituting the melted carbon content in molten iron and the solid carbon content in furnace dust into the calculation of the abscissa of point a, and the calculation formula of the abscissa of point a is:
in the above, n co The amount of material that is CO in the top gas;CO being top gas 2 The amount of substance>H being top gas 2 The amount of O species; n is n [c] N 'which is the amount of melted carbon in molten iron' [c] Omega for the amount of unburned coal dust and coke powder material discharged with the furnace dust CO 、/>Representing CO and CO in the top gas 2 Content of omega [C] 、ω' [C] The content of melted carbon in molten iron and the content of unburned pulverized coal and coke powder discharged along with furnace dust are represented by V, and the volume of blast furnace gas is represented by V.
4. The energy consumption estimation method based on the extended blast furnace Rist operation line of claim 1, wherein the point a ordinate calculation formula is:
in the above, ω (Fe 2 O 3 ) Representing Fe in ore 2 O 3 Is contained in the composition; omega(FeO) represents the content of FeO in the ore; omega (Fe) represents the total iron content of the ore.
5. The energy consumption estimation method based on the extended blast furnace Rist operation line of claim 1, wherein the abscissa of the E point is 0.
6. The energy consumption estimation method based on the extended blast furnace Rist operation line of claim 1, wherein the point E ordinate calculation formula is:
Y E ＝-(y f +y b )
in the above, y f The method is characterized by representing the oxygen intake amount of alloy element reduction and slag desulfurization in pig iron; y is b The amount of oxygen introduced into the blast furnace by the blast furnace is represented.
7. The method for estimating energy consumption based on the operation line of the expanded blast furnace rst according to claim 6, wherein the amount y of oxygen introduced into the pig iron by reducing alloy elements and desulfurizing slag f Including the amount of oxygen carried in by the Si, mn, S, P four elements, then:
y f ＝y [Si] +y [Mn] +y (s) +y [P]
in the above, y [Si] Represents the amount of oxygen carried in by Si element; y is [Mn] Represents the amount of oxygen carried in by Mn element; y is (s) Represents the amount of oxygen carried in by the S element; y is [P] Represents the amount of oxygen carried in by the P element.
8. The energy consumption estimation method based on the extended blast furnace Rist operation line of claim 7, wherein the method for calculating the oxygen amount carried in by the Si, mn, S, P four elements is as follows:
in the above formula, omega [ P ] represents the mass percentage of P element in pig iron; omega Si represents the mass percentage of Si element in pig iron; omega Mn represents the mass percentage of Mn element in pig iron; omega Fe represents the amount of reduced iron in pig iron; omega S represents the mass percent of sulfur in the slag; u represents the slag amount.
9. The method for estimating energy consumption based on the Rist operating line of an expanded blast furnace according to claim 6, wherein the amount of oxygen y introduced into the blast furnace by the blast furnace b The calculation formula of (2) is as follows:
in the above, V b The blast furnace blast volume;represents the oxygen content, omega Fe, in the blown hot air]Indicating the amount of reduced iron in pig iron.
10. The energy consumption estimation method based on the extended blast furnace Rist operation line according to claim 1, wherein the slope of the AE operation line is converted into a carbon ratio of blast furnace smelting, and the formula is as follows:
C' fixing device ＝k Fixing device ×12×Fe r /56
In the above, k Fixing device The slope of the AE operating line; fe (Fe) r Representing the amount of reduced iron per ton of pig iron; x is X A 、Y A Respectively the abscissa and the ordinate of the point A; x is X E 、Y E The abscissa and ordinate of the E point, respectively.
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